Collapsible core-bar



2 Sheets-Sheet l.

(No Model.)

No, 373,749. Patented Nov. 22, 1887.

FIC-5-1i- (No Model.) 2 Sheets-Sheet 2.

R. MORGAN.

GOLLAPSIBLB OGRE BAR.

No. C 73,749. Patented NOV.. 22, 1887.

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UNITED STATES PATnNT einen.

REESE MORGAN, OF NEIVPORT, KENTUCKY.

COLLAPSIBLE COREuBAR.

SPECIFICATION forming part of Letters Patent No. 373,749, dated November 22, 1887.

Application filed August 13, 1887. Serial No. 246,883. (No model.)

To all whom, t mag/concerm Be it known that l, Rnnsn MORGAN, of Newport, Campbell county, Kentucky, have invented a new and useful Improvement in Collapsible Core-Bars, of which the following is a specilication.

My invention relates to an improved construction of those central supports (known as eore-bars) of the cores of molds for casting large pipes and cylinders, that consist of a split tube or shell of cast-iron or steel whose walls are capable of being expanded to any desired diameter to receive the external loam orcoating for the mold-core for casting, and, after casting, of being contracted or collapsed, so as to enable the easy withdrawal of the bar 7 preparatory to cleaning out the casting.

My invention is particularly designed and is here shown adapted for use in what is known as the vertical method of casting.

In the accompanying drawings, Figure I is an axial section of my improved core-bar in the plane of the slit. the tongue and part of the braces being-shown in elevation. Fig. II is a section at right angles to Fig. I and on the line II II. Fig. III is a top view. Figs. IV and V are transverse sections on vthe lines IV IV and V V, Fig. II, respectively. FigVI is a detail View of a modification. Fig. VII is an axial section of one end of the tongue and the upper brace.

1 is a tube orshell, of cast-iron orsteel, having an inwardly-chamfered longitudinal slit, 2.

3, 4, and 4: respectively represent the uppermost, the lowermost, and one of several intermediate members of a series of cross bars or braces, which are, by means of bolts 5, made fast to that portion of the interior wall of the shell 1 which is diametrically opposite to the slit 2. So fastened to the braces as to be axial of the shell in its expanded condition is the customary spindle, 6. The slit 2 is closed interiorly by a wedge-formed tongue, 7, which has, at or near each brace, two pairs of oblique flanges, 8 9, which bear against correspondingly-inclined abutments 8 9. The obliquity of the flanges 9 is in planes parallel to that of the spindle and slit, and that of the flanges 8 is at right angles thereto. crate to expand or to contract the shell 1 according to whether the said tongue is depressed or elevated, and at the very same movement the flanges 9 operate to force the tongue outward or inward, so as at all times to close the slit 2. Depression and elevation of the tongue are accomplished by means of a screw, l0, which is journaled in a box, 11, that occupies a radial slot, 12, in the uppermost brace, 3, and whose threaded lower end occupies a nut, 14, that projects integrally from said tongue. The radial slot 12 permits slight outward and inward movements of the boxll corresponding to the described movements of the tongue. This concerted movement is secured by means Aof vertical flanges 15 of said tongue occupying corresponding grooves, 16, in the said box.

A modification of my shell expanding and contracting device is shown in Figs. VI and VII, in which oblique slots 8 on the tongne7 receive pins or studs 8', that extend interiorly from the shell-wall.

The only essential braces of my collapsible The anges 8 opv core-'bar are the top and bottom ones, 3 and 4. 75

Itis only forthe larger and especially the longer bars that one or more intermediate braces will be necessary.

A I claim as new and of my invention- The combination, with the longitudinallyslit shell or tube 1, having the cross-braces 3 4, of the wedge-formed tongue 7, whose two sets of oblique anges, 8 9, bear against corresponding abutments, 8' 9', and whose nut 14 receives a screw, 10, journaled in a box, 11, that occupies a radial slot, 12, of the uppermost brace, substantially as and for the purpose set forth.

In testimony of which invention I hereunto set my hand.

REESE MORGAN.

Attest:

Gao. H. KNIGHT, N. RooKHoLD. 

